基于自适应小波方法的小电流故障选线研究  

Research of Fault Line Selection of Non-direct-ground System Based on Selfadaptive Wavelet Method

作　　者：罗龙[1,2] 艾琳[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]杭州供电局,浙江杭州310018

出　　处：《广西电力》2008年第6期10-13,24,共5页Guangxi Electric Power

摘　　要：分析了小电流接地系统发生单相接地故障时的暂态故障特征,指出了传统小波选线方法的优点和需要改进的地方,提出了一种新型的自适应小波选线方法。该方法定义了2个衡量反映小波分解后各个尺度信息优劣的指标:绝对幅值强度和平均幅值强度,基于这2个指标,该方法能够自适应地选择分解尺度,提高选线结果的正确性。对仿真结果的分析表明了该方法的有效性和可行性。The transient fault characters of tingle-line-to-ground fault in no-direct-ground system are analyzed. The merits and demerits of traditional wavelet methods for fault line selection in no-direct-ground system are summarized and a new self-adaptive wavelet method is proposed. Two indices： absolute amplitude value and average amplitude value are defined to evaluate the nature of different scales of wavelet decomposition. Based on these indices, the proposed method can self-adaptively select decomposition scale and thus increase the correct rate offault line selection. The simulation result shows that the proposed method is effective.

关 键 词：小电流接地系统 故障选线 自适应小波方法 

分 类 号：TM711[电气工程—电力系统及自动化]